public class Pillar2 {
Geometry bottom;
double height;
Pillar2 (Geometry bottom,double height) {
this.bottom=bottom; this.height=height;
}
public double getVolume() {
if(bottom==null) {
System.out.println("没有底,无法计算体积");
return -1;
}
return bottom.getArea()*height;
}
}
